r-controlled
Correct.

form

Rule #10. When a vowel is followed by an "r" in the same syllable, that vowel is "r-controlled". It is not long nor short. "R-controlled "er,ir,and ur" often sound the same (like "er"). Examples: "term, sir, fir, fur, far, for, su/gar, or/der". The "o" is followed with an "r" making the "o" r-controlled.

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